1. Dept. of Environmental Engineering, Al-Hussein Bin Talal Univ., Ma'an, Jordan (corresponding author).
2. Associate Professor, Dept. of Civil and Environmental Engineering, Clarkson Univ., Potsdam, NY 13699-5710.
3. Professor, Dept. of Civil and Environmental Engineering, Clarkson University, Potsdam, NY 13699-5710.